John chisholm francis



(No Model.)

J. G. FRANCIS. TELEPHONE SWITCH.

Patented Jan. 3, 1893 2 3E: I I

a s ii 1 "7 I .M M w IHII q/vihwoo a5 MAM/Q6 M 105} UNITED STATES PATENTOFFICE.

TELEPHONE COMPANY, E SAMEPLACE:

LTELEPHQNEn-SWITCH'.

SEECIFIGATION forming part of Letters Patent No.488,993,'dated January3, 1893. Application filed February 15, 1892. Serial No. 421,560- (Romodeh To all whom it may concern:

,Be it known thatI, J onn Omsnonm FRAN-V 01s, a citizen of the UnitedStates, residing at York, have invented certain new and usefulimprovements in Telephone Switches, of

which the following isa specification.

My invention relates to telephone switches, and has for its object toprovide means whereby when the ordinary hand telephone or receiver is inposition on its hoolqthe switch will beheld in such a position as toinclude the signal devices in the line, andwh;en the hand telephone isremoved fromitshook for the operator to listemtheswitchtis automathcally moved. to cut out the signalingdevices, itnd include the telephoneinstruments in the l'ilG--.

To these ends my invention consists in'the construction and.it'rrazigemntsubstantially as hereinafter more particularly-pointedout;

Referring to the accompanyingdrawings, Figure 1, is a sectional device'fithrough the telephone switch, the box or supportshowing the positionof the parts when the hand telephone-is removed; Fig. 2, is a sidefviewof the sameg'Fig. 3, is asectional view-showing the position of theswitch when-the hand telephone is on the hook. s I i It is wellunderstood that'in operating the ordinary telephone lines, it isdesirable to have the circuits normally arranged,- so that the signaldevices at the 'subscribers station are normallyincluded in the line,while th'c telephone instruments are excluded, so {that not only is theresistance of the telephone in:

strumcu ts normally out of the line, but the instruments are less.liable to ,injury from excessive current orotherwise, which may passover the line; When, however, the instruments are to housed fortalking,it is equally I usually supporting the transmitter, signal dedesirableto have the signal devices excluded from. the main line so as to cut outtheir resistance, and to include the telephones, and

my invention involves a' simple, cheap and efiective switch, wherebythis may be accomplished.

In the drawings M represents a portion of the box, case, or othersupport for the switch, and this may of course be a part of the casevices, &c., belonging to the subscribers Sta-- tion. Supported in thiscase is the hook A,

JOHN CIIlSl-IOLM FRANCIS, NEW'YORK, NYQY, ASSIGNOR TO THE ECHO which isshown of a form to receive the ordinary hand or receiving telephone B.This hook is provided with a shank or shaft B, which extends throughthecasing M, and is preferably mounted in a bearing piece E, so astofurnisha good support for the book. This bearing piece E comprises a'plate E, which is adapted to fit on the outside of the box or case, andan inward projection E fitting in an opening in the case, and it may be"secured to the case by suitable screws F.

Mounted on the end of the shaft or spindle sitting essentially of ablock of insulating material provided with asectorD of conductingmaterial, and this may be secured to the spindle in any suitable way, asby ascrew d, so as not only to hold it in position,but form goodelectric connection between the sector and the spindle. The spindle orshaft is provided with a tension spring G, shown in the present instanceas a coiled spring, one end of which is fastened to the spindle, and theother to the bearing E and the tendency of this spring is to maintainthe parts in the position shown in Fig. 1.

Mounted upon suitable insulating plates as T, ,T' are the s ringcontacts or brushes S,

S S and these are arranged so as to non mally bear on the surface of thecommutator .O. Connected to these brushes are thewires leading tothe-usual instruments, as for in- -stauce, connected to the brush S is awire leading to the signaling devices, while the conductors connectedtothebrushes S and S lead to the telephone instruments in the usualway." In the present instance, these insulating plates are mounted uponposts or projections P, which are in turn connected to, or form part ofthe plates P, and these may be supported-or attached to the casing M inany suitable manner, or preferably as shown by the screws F, which alsohold the plate E in position. With this arrangement,

it will be seen that as shown in Fig. 1, with the hand telephone orreceiver removed, un-

der the tension of the spring, the hook and commutator are turned to theposition shown,

. so as to bring the conducting sector D under 'B,'i s a commutator orswitch piece .0, con- I II.

tomatically to the position shown in Fig. 3,

in which it will be seen that the conducting sector D, is under the endof the brush S leading to thesignai devices,while the brushes S and Srest upon the insulating portion of the commutator. Under theseconditions, the devices are in position to receive the signal callingthe subscriber, and as. soon as he removes his hand telephone to listento the call, the transmitter is automatically included in the cirouit'bythe rotation of the commutator under the influence of the spring andthe'signal devices are cut out. A

What I claim is '1. A telephone switch comprising a rotatahlehook forsupporting the telephone having a shaft rotating therewith in the planeof the hook, a commutator mounted on theshaft, and brushes bearing onthe commutator, substantially as described.

2. A telephone switch comprising a rotatable hook, having a shaftrotating therewi h in the plane of the hook a spring for rotating it, acommutator mounted on the shaft of the hook, the commutator having a.conductingportion connected tothe shaft, and contact terminals bearingon the commutator,

substantially as described.

3. A telephone switch comprising a mint able hook, the shaft of which ismounted in bearings of conducting material, a spring for rotating theshaft, a commutator mounted on the end of the shaft, and having aconductin'g portion connected to the shaft, and contact terminalsbearing on'the commutator,

substantially as described.

4. In a telephone switch, the combination of the rotatable hook, abearing for the same -the plane of the support, a commutator mounted onthe shaft, brushes bearing on the JNO. CHISHOLM FRANCIS.

Witnesses: I I

GEORGE G. ORosBY,

JOHN A. KHUNES

